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# TANDY/RADIO SHACK
RS-232 UPGRADE BOARD
Card Type Serial card
Chip Set Unidentified
Maximum Onboard Memory Unidentified
I/O Options Serial port
Hard Drives supported None
Floppy drives supported None
Data Bus SBus
Card Size Half-length, full-height card
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|-----------------------+-------+--------------------+-------|
| DB-25 serial port | CN1 | Sbus interface | CN2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS AND INTERRUPT SELECTION |
|------------------------------------------------------------|
| Address | IRQ | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|--------------+-------+---------+---------+--------+--------|
| COM1 (3F8h) | 4 | Off | Off | Off | On |
|--------------+-------+---------+---------+--------+--------|
| COM2 (2F8h) | 3 | Off | On | Off | On |
|--------------+-------+---------+---------+--------+--------|
| COM3 (3E8h) | 4 | On | Off | Off | On |
|--------------+-------+---------+---------+--------+--------|
| COM3 (3E8h) | 2 | On | Off | On | On |
|--------------+-------+---------+---------+--------+--------|
| COM4 (2F8h) | 3 | On | On | Off | On |
|--------------+-------+---------+---------+--------+--------|
| COM4 (2F8h) | 5 | On | On | On | On |
+------------------------------------------------------------+